Safari downloads a file called "Unknown". Please help.

Hi all,

I'm on OSX 10.6.5 running Safari 5.0.5.

Safari keeps downloading a file called "Unknown". It is 86 bytes.

Any ideas what it is, and why it keeps downloading?

I have emptied cache and cleared history. It has only been downloading said file the past could of days and I haven't changed anything system wise.

P.s. Please don't ask me to update to 10.6.7, I'm not wanting to at this time.

Thanks for your help.

Ash